Electrode.



UNITED s'ra'rns PA onmou.

JOSEPH L. R. HAYDEN, OF SGHENECTADY, YORK, ASSIGIIOE T0 GENERAL ELECTRIC COWANY, A CORPORATION OF NEW YORK.

' ELECTRODE.

Specification of Letters Yatent.

Patented J an. '7, 1913.

Ho Drawing. Original application filed July 9, 1910, Serial No. 571,105. Divided and this application filed May 1, 1912. Serial No. 694,513.

To all whom it may concern Be it known that I, JOSEPH L. R. HAYDEN, a citizen of the United States, residin at Schenectady, county of Schenectady, tate of New York, have invented certain new and useful Improvements in Electrodes, of

which the following is a specification.

My invention has reference to an electrode of the fiamin type. In lamps in which electrodes of tis character are used, practically all the light is emitted from the arc itself as distinguished from the incandescent tip or tips of one or both of the electrodes, as is the case when simple carbon electrodes are used.

In a former application, Serial No. 571,105, filed July 9, 1910, of which the present application is adivision, I have pointed out that while the titanium arc is white and eflicient, it is in general unsteady and that its operation is greatly improved by the use of a fluorin compound and that the fluorin may be introduced into the electrode as an element of a compound in which not only a metal, other than titanium, is present, but in which titanium itself is also present, as in that case a larger amount of fluorin relative to the metal, other than titanium, may be introduced, than would otherwise be possible. It was also pointed out that calcium titano-fluorid (GaTiF and cerium titano-fluorid (CeTiF were particularly valuable electrode constituents; the calcium titano-fluorid being used for a yellow light and cerium titano-fiuorid for a white light.

My present application has reference to that part of the invention set forth but'not claimed in my aforesaid prior application which is directed to the use of calcium ti-v tano-fiuorid in a flaming electrode in which metallic compounds other than the calcium titano-fiuorid may or may not be present.

I have made an excellent electrode by thoroughly admixing 40 per cent. of calcium titano-fluorid with 60 per cent. carbon and mixing with this a binding material and then squirt-111g the mixture and baking the resulting electrodes in the usual manner. My invention is equally applicable, however, to an electrode in which other constituents are present. For example, when a 'yellow flame electrode is desired a certain amountof calcium fluorid may be used to increase the efliciency of the electrode, and I have made an excellent electrode by using calcium titano-fiuorid 30 per cent; calcium fluorid 10 'per cent. and carbon 60 per cent, and makby Letters Patent of the United States, is, I

1. An electrode, the principal light-giving constituent of which is calcium titanofluorid.

2. A flaming electrode composed mainly of calcium titano-fluorid and carbon.

3. An electrode composed of a mixture of calcium titano-fluorid and carbon.

In witness whereof, I have hereunto set my hand this 30th day of April, 1912.

JOSEPH L. R. HAYDEN. Witnesses:

BENJAMIN B. HULL,

Harm: 011mm). 

